getColumnFamily() return null, which is not checked in ColumnFamilyStore.java
scan() method, causing Timeout Exception in query
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Key: CASSANDRA-2401
URL: https://issues.apache.org/jira/browse/CASSANDRA-2401
Project: Cassandra
Issue Type: Bug
Affects Versions: 0.7.4
Environment: Hector 0.7.0-28, Cassandra 0.7.4, Windows 7, Eclipse
Reporter: Tey Kar Shiang
ColumnFamilyStore.java, line near 1680, "ColumnFamily data =
getColumnFamily(new QueryFilter(dk, path, firstFilter))", the data is returned
null, causing NULL exception in "satisfies(data, clause, primary)" which is not
captured. The callback got timeout and return a Timeout exception to Hector.
The data is empty, as I traced, I have the the columns Count as 0 in
removeDeletedCF(), which return the null there. (I am new and trying to
understand the logics around still). Instead of crash to NULL, could we bypass
the data?
About my test:
A stress-test program to add, modify and delete data to keyspace. I have 30
threads simulate concurrent users to perform the actions above, and do a query
to all rows periodically. I have Column Family with rows (as File) and columns
as index (e.g. userID, fileType).
No issue on the first day of test, and stopped for 3 days. I restart the test
on 4th day, 1 of the users failed to query the files (timeout exception
received). Most of the users are still okay with the query.
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